Radar profiles across ice-shelf channels at the Roi Baudouin Ice Shelf, Antarctica ...
Ice shelves around Antarctica can restrict outlet glaciers and control ice-sheet mass loss. They often contain narrow, curvilinear tracts of thin ice termed ice-shelf channels. Their surface depressions display a morphology including deflections from flowlines and junctions. We investigate ice-shelf...
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| Format: | Dataset |
| Language: | English |
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PANGAEA
2023
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| Online Access: | https://dx.doi.org/10.1594/pangaea.907146 https://doi.pangaea.de/10.1594/PANGAEA.907146 |
| Summary: | Ice shelves around Antarctica can restrict outlet glaciers and control ice-sheet mass loss. They often contain narrow, curvilinear tracts of thin ice termed ice-shelf channels. Their surface depressions display a morphology including deflections from flowlines and junctions. We investigate ice-shelf channels in the Roi Baudouin Ice Shelf using the radar data and ice-flow modeling. In the shallow radar stratigraphy near the ice-shelf front, syncline and anticline stacks occur beneath the northeastern (i.e. upwind) and the southwestern (i.e. downwind) flanks of the surface depression, respectively. These structures are horizontally coherent and occur over the entire ice column, except near an ice-shelf channel junction where patterns change structurally with depth. Truncation of layers near basal incisions occurs both near the grounding line and farther seawards. Using ice-flow modelling, we show that the stratigraphy is $\sim$9 times more sensitive to atmospheric than to oceanic perturbations, and interpret ... |
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